Stolen credentials refer to usernames, passwords, or other authentication details that have been illegally obtained by unauthorized individuals. Cybercriminals often acquire these credentials through methods like phishing, malware, or data breaches. Once in possession of stolen credentials, attackers can gain unauthorized access to accounts, systems, or sensitive data, potentially leading to identity theft, financial loss, or further cyberattacks. Protecting credentials with strong passwords and multi-factor authentication is essential to reduce the risk of compromise.